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C H A P T E R 1 1
Area 2
Area 1
RIP and OSPF
Virtual link
ABR
Figure 21: Virtual link for stub area
Virtual links are also used to repair a discontiguous backbone area.
For example, in Figure 22, if the connection between ABR1 and the
backbone fails, the connection using ABR2 provides redundancy so
that the discontiguous area can continue to communicate with the
backbone using the virtual link.
Virtual link
ABR 1
Figure 22: Virtual link providing redundancy
ABR
Area 1
Area 2
Area 0
Area 0
ABR 2
Area 3
480t_012
480t_013
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